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<div class="title">samples/cpp/watershed.cpp</div>  </div>
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<p>An example using the watershed algorithm</p>
<div class="fragment"><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../d1/d4e/utility_8hpp.html">opencv2/core/utility.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d1/d4f/imgproc_2include_2opencv2_2imgproc_8hpp.html">opencv2/imgproc.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d6/d87/imgcodecs_8hpp.html">opencv2/imgcodecs.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d4/dd5/highgui_8hpp.html">opencv2/highgui.hpp</a>&quot;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;cstdio&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d8/dcc/namespacestd.html">std</a>;</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> help(<span class="keywordtype">char</span>** argv)</div><div class="line">{</div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;\nThis program demonstrates the famous watershed segmentation algorithm in OpenCV: watershed()\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;Usage:\n&quot;</span> &lt;&lt; argv[0] &lt;&lt;<span class="stringliteral">&quot; [image_name -- default is fruits.jpg]\n&quot;</span> &lt;&lt; endl;</div><div class="line"></div><div class="line"></div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;Hot keys: \n&quot;</span></div><div class="line">        <span class="stringliteral">&quot;\tESC - quit the program\n&quot;</span></div><div class="line">        <span class="stringliteral">&quot;\tr - restore the original image\n&quot;</span></div><div class="line">        <span class="stringliteral">&quot;\tw or SPACE - run watershed segmentation algorithm\n&quot;</span></div><div class="line">        <span class="stringliteral">&quot;\t\t(before running it, *roughly* mark the areas to segment on the image)\n&quot;</span></div><div class="line">        <span class="stringliteral">&quot;\t  (before that, roughly outline several markers on the image)\n&quot;</span>;</div><div class="line">}</div><div class="line"><a name="_a0"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> markerMask, img;</div><div class="line"><a name="_a1"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> prevPt(-1, -1);</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> onMouse( <span class="keywordtype">int</span> event, <span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y, <span class="keywordtype">int</span> flags, <span class="keywordtype">void</span>* )</div><div class="line">{</div><div class="line">    <span class="keywordflow">if</span>( x &lt; 0 || x &gt;= img.<a name="a2"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#aa3e5a47585c9ef6a0842556739155e3e">cols</a> || y &lt; 0 || y &gt;= img.<a name="a3"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#abed816466c45234254d25bc59c31245e">rows</a> )</div><div class="line">        <span class="keywordflow">return</span>;</div><div class="line">    <span class="keywordflow">if</span>( event == <a name="a4"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#gga927593befdddc7e7013602bca9b079b0a59cad7ffe959adf2782a110196d47bf6">EVENT_LBUTTONUP</a> || !(flags &amp; <a name="a5"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#ggaab4dc057947f70058c80626c9f1c25cead9b7a4f148eeff7eca24609f7a64adb1">EVENT_FLAG_LBUTTON</a>) )</div><div class="line">        prevPt = <a name="a6"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(-1,-1);</div><div class="line">    <span class="keywordflow">else</span> <span class="keywordflow">if</span>( event == <a name="a7"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#gga927593befdddc7e7013602bca9b079b0ad3419100fc2d7688c6dbe3da030fbfd9">EVENT_LBUTTONDOWN</a> )</div><div class="line">        prevPt = <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(x,y);</div><div class="line">    <span class="keywordflow">else</span> <span class="keywordflow">if</span>( event == <a name="a8"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#gga927593befdddc7e7013602bca9b079b0a8f2ec5fd35fe3f4b696518b146dcf675">EVENT_MOUSEMOVE</a> &amp;&amp; (flags &amp; EVENT_FLAG_LBUTTON) )</div><div class="line">    {</div><div class="line">        <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> pt(x, y);</div><div class="line">        <span class="keywordflow">if</span>( prevPt.<a name="a9"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a> &lt; 0 )</div><div class="line">            prevPt = pt;</div><div class="line">        <a name="a10"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2">line</a>( markerMask, prevPt, pt, <a name="a11"></a><a class="code" href="../../d1/da0/classcv_1_1Scalar__.html#ac1509a4b8454fe7fe29db069e13a2e6f">Scalar::all</a>(255), 5, 8, 0 );</div><div class="line">        <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2">line</a>( img, prevPt, pt, <a class="code" href="../../d1/da0/classcv_1_1Scalar__.html#ac1509a4b8454fe7fe29db069e13a2e6f">Scalar::all</a>(255), 5, 8, 0 );</div><div class="line">        prevPt = pt;</div><div class="line">        <a name="a12"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;image&quot;</span>, img);</div><div class="line">    }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main( <span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>** argv )</div><div class="line">{</div><div class="line">    <a name="_a13"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html">cv::CommandLineParser</a> parser(argc, argv, <span class="stringliteral">&quot;{help h | | }{ @input | fruits.jpg | }&quot;</span>);</div><div class="line">    <span class="keywordflow">if</span> (parser.<a name="a14"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a8c41cf242b2ad8c0472e3b57893ef200">has</a>(<span class="stringliteral">&quot;help&quot;</span>))</div><div class="line">    {</div><div class="line">        help(argv);</div><div class="line">        <span class="keywordflow">return</span> 0;</div><div class="line">    }</div><div class="line">    <span class="keywordtype">string</span> filename = <a name="a15"></a><a class="code" href="../../d6/dba/group__core__utils__samples.html#ga3a33b00033b46c698ff6340d95569c13">samples::findFile</a>(parser.<a name="a16"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a190215863579a6d244dccfd261ee0224">get</a>&lt;<span class="keywordtype">string</span>&gt;(<span class="stringliteral">&quot;@input&quot;</span>));</div><div class="line">    <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> img0 = <a name="a17"></a><a class="code" href="../../d4/da8/group__imgcodecs.html#ga288b8b3da0892bd651fce07b3bbd3a56">imread</a>(filename, 1), imgGray;</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span>( img0.<a name="a18"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#abbec3525a852e77998aba034813fded4">empty</a>() )</div><div class="line">    {</div><div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;Couldn&#39;t open image &quot;</span>;</div><div class="line">        help(argv);</div><div class="line">        <span class="keywordflow">return</span> 0;</div><div class="line">    }</div><div class="line">    help(argv);</div><div class="line">    <a name="a19"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b">namedWindow</a>( <span class="stringliteral">&quot;image&quot;</span>, 1 );</div><div class="line"></div><div class="line">    img0.<a name="a20"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#a33fd5d125b4c302b0c9aa86980791a77">copyTo</a>(img);</div><div class="line">    <a name="a21"></a><a class="code" href="../../d8/d01/group__imgproc__color__conversions.html#ga397ae87e1288a81d2363b61574eb8cab">cvtColor</a>(img, markerMask, <a name="a22"></a><a class="code" href="../../d8/d01/group__imgproc__color__conversions.html#gga4e0972be5de079fed4e3a10e24ef5ef0a353a4b8db9040165db4dacb5bcefb6ea">COLOR_BGR2GRAY</a>);</div><div class="line">    <a class="code" href="../../d8/d01/group__imgproc__color__conversions.html#ga397ae87e1288a81d2363b61574eb8cab">cvtColor</a>(markerMask, imgGray, <a name="a23"></a><a class="code" href="../../d8/d01/group__imgproc__color__conversions.html#gga4e0972be5de079fed4e3a10e24ef5ef0a869da65c045477f2f17d39395df65b2d">COLOR_GRAY2BGR</a>);</div><div class="line">    markerMask = <a class="code" href="../../d1/da0/classcv_1_1Scalar__.html#ac1509a4b8454fe7fe29db069e13a2e6f">Scalar::all</a>(0);</div><div class="line">    <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>( <span class="stringliteral">&quot;image&quot;</span>, img );</div><div class="line">    <a name="a24"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga89e7806b0a616f6f1d502bd8c183ad3e">setMouseCallback</a>( <span class="stringliteral">&quot;image&quot;</span>, onMouse, 0 );</div><div class="line"></div><div class="line">    <span class="keywordflow">for</span>(;;)</div><div class="line">    {</div><div class="line">        <span class="keywordtype">char</span> c = (char)<a name="a25"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">waitKey</a>(0);</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span>( c == 27 )</div><div class="line">            <span class="keywordflow">break</span>;</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span>( c == <span class="charliteral">&#39;r&#39;</span> )</div><div class="line">        {</div><div class="line">            markerMask = <a class="code" href="../../d1/da0/classcv_1_1Scalar__.html#ac1509a4b8454fe7fe29db069e13a2e6f">Scalar::all</a>(0);</div><div class="line">            img0.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#a33fd5d125b4c302b0c9aa86980791a77">copyTo</a>(img);</div><div class="line">            <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>( <span class="stringliteral">&quot;image&quot;</span>, img );</div><div class="line">        }</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span>( c == <span class="charliteral">&#39;w&#39;</span> || c == <span class="charliteral">&#39; &#39;</span> )</div><div class="line">        {</div><div class="line">            <span class="keywordtype">int</span> i, j, compCount = 0;</div><div class="line">            vector&lt;vector&lt;Point&gt; &gt; contours;</div><div class="line">            vector&lt;Vec4i&gt; hierarchy;</div><div class="line"></div><div class="line">            <a name="a26"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#gadf1ad6a0b82947fa1fe3c3d497f260e0">findContours</a>(markerMask, contours, hierarchy, <a name="a27"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#gga819779b9857cc2f8601e6526a3a5bc71a7d1d4b509fb2a9a8dc2f960357748752">RETR_CCOMP</a>, <a name="a28"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#gga4303f45752694956374734a03c54d5ffa5f2883048e654999209f88ba04c302f5">CHAIN_APPROX_SIMPLE</a>);</div><div class="line"></div><div class="line">            <span class="keywordflow">if</span>( contours.empty() )</div><div class="line">                <span class="keywordflow">continue</span>;</div><div class="line">            <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> markers(markerMask.<a name="a29"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#a146f8e8dda07d1365a575ab83d9828d1">size</a>(), <a name="a30"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga4067910fc388075c3ea3aa14393e83b9">CV_32S</a>);</div><div class="line">            markers = <a class="code" href="../../d1/da0/classcv_1_1Scalar__.html#ac1509a4b8454fe7fe29db069e13a2e6f">Scalar::all</a>(0);</div><div class="line">            <span class="keywordtype">int</span> idx = 0;</div><div class="line">            <span class="keywordflow">for</span>( ; idx &gt;= 0; idx = hierarchy[idx][0], compCount++ )</div><div class="line">                <a name="a31"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga746c0625f1781f1ffc9056259103edbc">drawContours</a>(markers, contours, idx, <a class="code" href="../../d1/da0/classcv_1_1Scalar__.html#ac1509a4b8454fe7fe29db069e13a2e6f">Scalar::all</a>(compCount+1), -1, 8, hierarchy, INT_MAX);</div><div class="line"></div><div class="line">            <span class="keywordflow">if</span>( compCount == 0 )</div><div class="line">                <span class="keywordflow">continue</span>;</div><div class="line"></div><div class="line">            vector&lt;Vec3b&gt; colorTab;</div><div class="line">            <span class="keywordflow">for</span>( i = 0; i &lt; compCount; i++ )</div><div class="line">            {</div><div class="line">                <span class="keywordtype">int</span> b = <a name="a32"></a><a class="code" href="../../d2/de8/group__core__array.html#ga75843061d150ad6564b5447e38e57722">theRNG</a>().<a name="a33"></a><a class="code" href="../../d1/dd6/classcv_1_1RNG.html#acde197860cea91e5aa896be8719457ae">uniform</a>(0, 255);</div><div class="line">                <span class="keywordtype">int</span> g = <a class="code" href="../../d2/de8/group__core__array.html#ga75843061d150ad6564b5447e38e57722">theRNG</a>().<a class="code" href="../../d1/dd6/classcv_1_1RNG.html#acde197860cea91e5aa896be8719457ae">uniform</a>(0, 255);</div><div class="line">                <span class="keywordtype">int</span> r = <a class="code" href="../../d2/de8/group__core__array.html#ga75843061d150ad6564b5447e38e57722">theRNG</a>().<a class="code" href="../../d1/dd6/classcv_1_1RNG.html#acde197860cea91e5aa896be8719457ae">uniform</a>(0, 255);</div><div class="line"></div><div class="line">                colorTab.push_back(<a name="a34"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga7e6060c0b8d48459964df6e1eb524c03">Vec3b</a>((<a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga65f85814a8290f9797005d3b28e7e5fc">uchar</a>)b, (<a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga65f85814a8290f9797005d3b28e7e5fc">uchar</a>)g, (<a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga65f85814a8290f9797005d3b28e7e5fc">uchar</a>)r));</div><div class="line">            }</div><div class="line"></div><div class="line">            <span class="keywordtype">double</span> t = (double)<a name="a35"></a><a class="code" href="../../db/de0/group__core__utils.html#gae73f58000611a1af25dd36d496bf4487">getTickCount</a>();</div><div class="line">            <a name="a36"></a><a class="code" href="../../d3/d47/group__imgproc__segmentation.html#ga3267243e4d3f95165d55a618c65ac6e1">watershed</a>( img0, markers );</div><div class="line">            t = (double)<a class="code" href="../../db/de0/group__core__utils.html#gae73f58000611a1af25dd36d496bf4487">getTickCount</a>() - t;</div><div class="line">            printf( <span class="stringliteral">&quot;execution time = %gms\n&quot;</span>, t*1000./<a name="a37"></a><a class="code" href="../../db/de0/group__core__utils.html#ga705441a9ef01f47acdc55d87fbe5090c">getTickFrequency</a>() );</div><div class="line"></div><div class="line">            <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> wshed(markers.size(), <a name="a38"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga88c4cd9de76f678f33928ef1e3f96047">CV_8UC3</a>);</div><div class="line"></div><div class="line">            <span class="comment">// paint the watershed image</span></div><div class="line">            <span class="keywordflow">for</span>( i = 0; i &lt; markers.rows; i++ )</div><div class="line">                <span class="keywordflow">for</span>( j = 0; j &lt; markers.cols; j++ )</div><div class="line">                {</div><div class="line">                    <span class="keywordtype">int</span> <a name="a39"></a><a class="code" href="../../d9/db7/group__datasets__gr.html#gga82775e152f8a74c5fe06f5a7343e0233a9dfc90ef6dc3ba62850d76cc3534572c">index</a> = markers.at&lt;<span class="keywordtype">int</span>&gt;(i,j);</div><div class="line">                    <span class="keywordflow">if</span>( index == -1 )</div><div class="line">                        wshed.at&lt;<a name="_a40"></a><a class="code" href="../../d6/dcf/classcv_1_1Vec.html">Vec3b</a>&gt;(i,j) = <a class="code" href="../../dc/d84/group__core__basic.html#ga7e6060c0b8d48459964df6e1eb524c03">Vec3b</a>(255,255,255);</div><div class="line">                    <span class="keywordflow">else</span> <span class="keywordflow">if</span>( index &lt;= 0 || index &gt; compCount )</div><div class="line">                        wshed.at&lt;<a class="code" href="../../d6/dcf/classcv_1_1Vec.html">Vec3b</a>&gt;(i,j) = <a class="code" href="../../dc/d84/group__core__basic.html#ga7e6060c0b8d48459964df6e1eb524c03">Vec3b</a>(0,0,0);</div><div class="line">                    <span class="keywordflow">else</span></div><div class="line">                        wshed.at&lt;<a class="code" href="../../d6/dcf/classcv_1_1Vec.html">Vec3b</a>&gt;(i,j) = colorTab[index - 1];</div><div class="line">                }</div><div class="line"></div><div class="line">            wshed = wshed*0.5 + imgGray*0.5;</div><div class="line">            <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>( <span class="stringliteral">&quot;watershed transform&quot;</span>, wshed );</div><div class="line">        }</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keywordflow">return</span> 0;</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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